Shell script helping to relocate an MXE prefix; see https://github.com/mxe/mxe/issues/1700

mxe-relocate.sh

#!/usr/bin/env bash

help="Relocate an MXE prefix\n\
\n\
Usage: $0 old_path new_path prefix\n\
\n\
  old and new paths must be absolute\n\
  new path must not be longer than the old one\n\n"

if [ "x$3" = "x" ] || [ "x$2" = "x" ] || [ "x$1" = "x" ]; then
  printf "$help"
  exit 1
fi
if [ "x$1" = "x--help" ]; then
  printf "$help"
  exit 0
fi

old="${1%/}"
new="${2%/}"
pfx="$3"
oldLen=$(printf "$old" | wc -c)
newLen=$(printf "$new" | wc -c)

if [ $newLen -gt $oldLen ]; then
  echo "Error: the new path must not be longer than the old one"
  exit 1
fi

# prepend the new path with forward slashes until it has
# the same lenght as the old path
new="$(printf %$(($oldLen - $newLen))s | tr ' ' '/')$new"

# simple and quick check if this is an MXE prefix
if [ ! -f "$pfx/installed/check-requirements" ] || \
   [ ! -x "$pfx/bin/config.guess" ];
then
  echo "Error: this doesn't look like an MXE prefix!"
  echo "Be sure to point to the MXE \`usr' directory."
  exit 1
fi

printf "\nold: $old\nnew: $new\n\n"
read -r -p "Do you want to substitute the old path with the new path? [y/N] " response
echo ""
if [[ ! "${response,,}" =~ ^(yes|y)$ ]]; then
  echo "Goodbye!"
  exit 0
fi

find "$pfx"/* -type f -print -exec sed -i "s|$old|$new|g" '{}' \;

echo "Done!"